Bump org.postgresql:postgresql from 42.5.1 to 42.6.0 in /http4k-app (#26

)

Bumps [org.postgresql:postgresql](https://github.com/pgjdbc/pgjdbc) from 42.5.1 to 42.6.0.
- [Release notes](https://github.com/pgjdbc/pgjdbc/releases)
- [Changelog](https://github.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md)
- [Commits](pgjdbc/pgjdbc@REL42.5.1...REL42.6.0)

---
updated-dependencies:
- dependency-name: org.postgresql:postgresql
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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http4k-app/build.gradle

@@ -55,7 +55,7 @@ dependencies {
     implementation "org.http4k:http4k-cloudnative:${http4kVersion}"
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk8:${kotlinVersion}"
 
-    implementation "org.postgresql:postgresql:42.5.1"
+    implementation "org.postgresql:postgresql:42.6.0"
 
     implementation "com.bettercloud:vault-java-driver:5.1.0"